+// This file is Copyright its original authors, visible in version control
+// history.
+//
+// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
+// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
+// You may not use this file except in accordance with one or both of these
+// licenses.
+
//! keysinterface provides keys into rust-lightning and defines some useful enums which describe
//! spendable on-chain outputs which the user owns and is responsible for using just as any other
//! on-chain output which is theirs.
-use bitcoin::blockdata::transaction::{Transaction, OutPoint, TxOut};
+use bitcoin::blockdata::transaction::{Transaction, TxOut, SigHashType};
use bitcoin::blockdata::script::{Script, Builder};
use bitcoin::blockdata::opcodes;
use bitcoin::network::constants::Network;
use util::byte_utils;
use util::ser::{Writeable, Writer, Readable};
+use chain::transaction::OutPoint;
use ln::chan_utils;
-use ln::chan_utils::{TxCreationKeys, HTLCOutputInCommitment, make_funding_redeemscript, ChannelPublicKeys, LocalCommitmentTransaction};
-use ln::msgs;
+use ln::chan_utils::{HTLCOutputInCommitment, make_funding_redeemscript, ChannelPublicKeys, LocalCommitmentTransaction, PreCalculatedTxCreationKeys};
+use ln::msgs::UnsignedChannelAnnouncement;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::io::Error;
// TODO: Document the things someone using this interface should enforce before signing.
// TODO: Add more input vars to enable better checking (preferably removing commitment_tx and
// making the callee generate it via some util function we expose)!
- fn sign_remote_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, feerate_per_kw: u32, commitment_tx: &Transaction, keys: &TxCreationKeys, htlcs: &[&HTLCOutputInCommitment], secp_ctx: &Secp256k1<T>) -> Result<(Signature, Vec<Signature>), ()>;
+ fn sign_remote_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, feerate_per_kw: u32, commitment_tx: &Transaction, keys: &PreCalculatedTxCreationKeys, htlcs: &[&HTLCOutputInCommitment], secp_ctx: &Secp256k1<T>) -> Result<(Signature, Vec<Signature>), ()>;
/// Create a signature for a local commitment transaction. This will only ever be called with
/// the same local_commitment_tx (or a copy thereof), though there are currently no guarantees
/// transactions which will be broadcasted later, after the channel has moved on to a newer
/// state. Thus, needs its own method as sign_local_commitment may enforce that we only ever
/// get called once.
- #[cfg(test)]
+ #[cfg(any(test,feature = "unsafe_revoked_tx_signing"))]
fn unsafe_sign_local_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()>;
/// Create a signature for each HTLC transaction spending a local commitment transaction.
/// Note that if this fails or is rejected, the channel will not be publicly announced and
/// our counterparty may (though likely will not) close the channel on us for violating the
/// protocol.
- fn sign_channel_announcement<T: secp256k1::Signing>(&self, msg: &msgs::UnsignedChannelAnnouncement, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()>;
+ fn sign_channel_announcement<T: secp256k1::Signing>(&self, msg: &UnsignedChannelAnnouncement, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()>;
/// Set the remote channel basepoints and remote/local to_self_delay.
/// This is done immediately on incoming channels and as soon as the channel is accepted on outgoing channels.
/// Get a new set of ChannelKeys for per-channel secrets. These MUST be unique even if you
/// restarted with some stale data!
fn get_channel_keys(&self, inbound: bool, channel_value_satoshis: u64) -> Self::ChanKeySigner;
- /// Get a secret and PRNG seed for constructing an onion packet
- fn get_onion_rand(&self) -> (SecretKey, [u8; 32]);
- /// Get a unique temporary channel id. Channels will be referred to by this until the funding
- /// transaction is created, at which point they will use the outpoint in the funding
- /// transaction.
- fn get_channel_id(&self) -> [u8; 32];
+ /// Gets a unique, cryptographically-secure, random 32 byte value. This is used for encrypting
+ /// onion packets and for temporary channel IDs. There is no requirement that these be
+ /// persisted anywhere, though they must be unique across restarts.
+ fn get_secure_random_bytes(&self) -> [u8; 32];
}
#[derive(Clone)]
fn pubkeys(&self) -> &ChannelPublicKeys { &self.local_channel_pubkeys }
fn key_derivation_params(&self) -> (u64, u64) { self.key_derivation_params }
- fn sign_remote_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, feerate_per_kw: u32, commitment_tx: &Transaction, keys: &TxCreationKeys, htlcs: &[&HTLCOutputInCommitment], secp_ctx: &Secp256k1<T>) -> Result<(Signature, Vec<Signature>), ()> {
+ fn sign_remote_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, feerate_per_kw: u32, commitment_tx: &Transaction, pre_keys: &PreCalculatedTxCreationKeys, htlcs: &[&HTLCOutputInCommitment], secp_ctx: &Secp256k1<T>) -> Result<(Signature, Vec<Signature>), ()> {
if commitment_tx.input.len() != 1 { return Err(()); }
+ let keys = pre_keys.trust_key_derivation();
let funding_pubkey = PublicKey::from_secret_key(secp_ctx, &self.funding_key);
let accepted_data = self.accepted_channel_data.as_ref().expect("must accept before signing");
let channel_funding_redeemscript = make_funding_redeemscript(&funding_pubkey, &accepted_data.remote_channel_pubkeys.funding_pubkey);
- let commitment_sighash = hash_to_message!(&bip143::SighashComponents::new(&commitment_tx).sighash_all(&commitment_tx.input[0], &channel_funding_redeemscript, self.channel_value_satoshis)[..]);
+ let commitment_sighash = hash_to_message!(&bip143::SigHashCache::new(commitment_tx).signature_hash(0, &channel_funding_redeemscript, self.channel_value_satoshis, SigHashType::All)[..]);
let commitment_sig = secp_ctx.sign(&commitment_sighash, &self.funding_key);
let commitment_txid = commitment_tx.txid();
if let Some(_) = htlc.transaction_output_index {
let htlc_tx = chan_utils::build_htlc_transaction(&commitment_txid, feerate_per_kw, accepted_data.local_to_self_delay, htlc, &keys.a_delayed_payment_key, &keys.revocation_key);
let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
- let htlc_sighash = hash_to_message!(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]);
+ let htlc_sighash = hash_to_message!(&bip143::SigHashCache::new(&htlc_tx).signature_hash(0, &htlc_redeemscript, htlc.amount_msat / 1000, SigHashType::All)[..]);
let our_htlc_key = match chan_utils::derive_private_key(&secp_ctx, &keys.per_commitment_point, &self.htlc_base_key) {
Ok(s) => s,
Err(_) => return Err(()),
Ok(local_commitment_tx.get_local_sig(&self.funding_key, &channel_funding_redeemscript, self.channel_value_satoshis, secp_ctx))
}
- #[cfg(test)]
+ #[cfg(any(test,feature = "unsafe_revoked_tx_signing"))]
fn unsafe_sign_local_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
let funding_pubkey = PublicKey::from_secret_key(secp_ctx, &self.funding_key);
let remote_channel_pubkeys = &self.accepted_channel_data.as_ref().expect("must accept before signing").remote_channel_pubkeys;
};
chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.local_to_self_delay(), &remote_delayedpubkey)
};
- let sighash_parts = bip143::SighashComponents::new(&justice_tx);
- let sighash = hash_to_message!(&sighash_parts.sighash_all(&justice_tx.input[input], &witness_script, amount)[..]);
+ let mut sighash_parts = bip143::SigHashCache::new(justice_tx);
+ let sighash = hash_to_message!(&sighash_parts.signature_hash(input, &witness_script, amount, SigHashType::All)[..]);
return Ok(secp_ctx.sign(&sighash, &revocation_key))
}
} else { return Err(()) }
} else { return Err(()) }
} else { return Err(()) };
- let sighash_parts = bip143::SighashComponents::new(&htlc_tx);
- let sighash = hash_to_message!(&sighash_parts.sighash_all(&htlc_tx.input[input], &witness_script, amount)[..]);
+ let mut sighash_parts = bip143::SigHashCache::new(htlc_tx);
+ let sighash = hash_to_message!(&sighash_parts.signature_hash(input, &witness_script, amount, SigHashType::All)[..]);
return Ok(secp_ctx.sign(&sighash, &htlc_key))
}
Err(())
let remote_channel_data = self.accepted_channel_data.as_ref().expect("must accept before signing");
let channel_funding_redeemscript = make_funding_redeemscript(&funding_pubkey, &remote_channel_data.remote_channel_pubkeys.funding_pubkey);
- let sighash = hash_to_message!(&bip143::SighashComponents::new(closing_tx)
- .sighash_all(&closing_tx.input[0], &channel_funding_redeemscript, self.channel_value_satoshis)[..]);
+ let sighash = hash_to_message!(&bip143::SigHashCache::new(closing_tx)
+ .signature_hash(0, &channel_funding_redeemscript, self.channel_value_satoshis, SigHashType::All)[..]);
Ok(secp_ctx.sign(&sighash, &self.funding_key))
}
- fn sign_channel_announcement<T: secp256k1::Signing>(&self, msg: &msgs::UnsignedChannelAnnouncement, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
+ fn sign_channel_announcement<T: secp256k1::Signing>(&self, msg: &UnsignedChannelAnnouncement, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()> {
let msghash = hash_to_message!(&Sha256dHash::hash(&msg.encode()[..])[..]);
Ok(secp_ctx.sign(&msghash, &self.funding_key))
}
shutdown_pubkey: PublicKey,
channel_master_key: ExtendedPrivKey,
channel_child_index: AtomicUsize,
- session_master_key: ExtendedPrivKey,
- session_child_index: AtomicUsize,
- channel_id_master_key: ExtendedPrivKey,
- channel_id_child_index: AtomicUsize,
+ rand_bytes_master_key: ExtendedPrivKey,
+ rand_bytes_child_index: AtomicUsize,
seed: [u8; 32],
starting_time_secs: u64,
impl KeysManager {
/// Constructs a KeysManager from a 32-byte seed. If the seed is in some way biased (eg your
- /// RNG is busted) this may panic (but more importantly, you will possibly lose funds).
+ /// CSRNG is busted) this may panic (but more importantly, you will possibly lose funds).
/// starting_time isn't strictly required to actually be a time, but it must absolutely,
/// without a doubt, be unique to this instance. ie if you start multiple times with the same
/// seed, starting_time must be unique to each run. Thus, the easiest way to achieve this is to
Err(_) => panic!("Your RNG is busted"),
};
let channel_master_key = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(3).unwrap()).expect("Your RNG is busted");
- let session_master_key = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(4).unwrap()).expect("Your RNG is busted");
- let channel_id_master_key = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(5).unwrap()).expect("Your RNG is busted");
+ let rand_bytes_master_key = master_key.ckd_priv(&secp_ctx, ChildNumber::from_hardened_idx(4).unwrap()).expect("Your RNG is busted");
KeysManager {
secp_ctx,
shutdown_pubkey,
channel_master_key,
channel_child_index: AtomicUsize::new(0),
- session_master_key,
- session_child_index: AtomicUsize::new(0),
- channel_id_master_key,
- channel_id_child_index: AtomicUsize::new(0),
+ rand_bytes_master_key,
+ rand_bytes_child_index: AtomicUsize::new(0),
seed: *seed,
starting_time_secs,
self.shutdown_pubkey.clone()
}
- fn get_channel_keys(&self, _inbound: bool, channel_value_satoshis: u64) -> InMemoryChannelKeys {
+ fn get_channel_keys(&self, _inbound: bool, channel_value_satoshis: u64) -> Self::ChanKeySigner {
let child_ix = self.channel_child_index.fetch_add(1, Ordering::AcqRel);
let ix_and_nanos: u64 = (child_ix as u64) << 32 | (self.starting_time_nanos as u64);
self.derive_channel_keys(channel_value_satoshis, ix_and_nanos, self.starting_time_secs)
}
- fn get_onion_rand(&self) -> (SecretKey, [u8; 32]) {
- let mut sha = self.derive_unique_start();
-
- let child_ix = self.session_child_index.fetch_add(1, Ordering::AcqRel);
- let child_privkey = self.session_master_key.ckd_priv(&self.secp_ctx, ChildNumber::from_hardened_idx(child_ix as u32).expect("key space exhausted")).expect("Your RNG is busted");
- sha.input(&child_privkey.private_key.key[..]);
-
- let mut rng_seed = sha.clone();
- // Not exactly the most ideal construction, but the second value will get fed into
- // ChaCha so it is another step harder to break.
- rng_seed.input(b"RNG Seed Salt");
- sha.input(b"Session Key Salt");
- (SecretKey::from_slice(&Sha256::from_engine(sha).into_inner()).expect("Your RNG is busted"),
- Sha256::from_engine(rng_seed).into_inner())
- }
-
- fn get_channel_id(&self) -> [u8; 32] {
+ fn get_secure_random_bytes(&self) -> [u8; 32] {
let mut sha = self.derive_unique_start();
- let child_ix = self.channel_id_child_index.fetch_add(1, Ordering::AcqRel);
- let child_privkey = self.channel_id_master_key.ckd_priv(&self.secp_ctx, ChildNumber::from_hardened_idx(child_ix as u32).expect("key space exhausted")).expect("Your RNG is busted");
+ let child_ix = self.rand_bytes_child_index.fetch_add(1, Ordering::AcqRel);
+ let child_privkey = self.rand_bytes_master_key.ckd_priv(&self.secp_ctx, ChildNumber::from_hardened_idx(child_ix as u32).expect("key space exhausted")).expect("Your RNG is busted");
sha.input(&child_privkey.private_key.key[..]);
+ sha.input(b"Unique Secure Random Bytes Salt");
Sha256::from_engine(sha).into_inner()
}
}
projects / rust-lightning / blobdiff